Global Patent Index - EP 0394916 A1

EP 0394916 A1 19901031 - Ultrashort optical pulse modulating equipment.

Title (en)

Ultrashort optical pulse modulating equipment.

Title (de)

Modulationseinrichtung für ultrakurze optische Impulse.

Title (fr)

Dispositif de modulation d'impulsions optiques ultracourtes.

Publication

EP 0394916 A1 19901031 (EN)

Application

EP 90107651 A 19900423

Priority

JP 10173089 A 19890424

Abstract (en)

In ultrashort optical pulse modulating equipment optical pulses (Lp) emitted from a laser (11) in synchronism with input electrical signals (S) are modulated by the electrical signals, the modulated optical pulses are applied to a first-stage pulse interval compressor (41), in which they are alternately distributed, one by one, by an optical switch (17) to two optical fiber delay lines (141, 142), two modulated optical pulses delayed by the two optical fiber delay lines (141, 142) are brought close to each other, and modulated optical pulse groups, each composed of two closely spaced modulated optical pulses, are output from an optical coupler (19). Also in the next-stage pulse interval compressor (42) the modulated optical pulse groups input thereinto are alternately distributed, one by one, by an optical switch (17) to two optical fiber delay lines (141, 142) in which predetermined delays are caused in the modulated optical pulse groups, respectively, and then they are coupled together by an optical coupler (19), thereby creating modulated optical pulse groups each composed of four modulated optical pulses. In this way, modulated optical pulse groups are applied to n cascade-connected pulse interval compressors one after another, in which they are brought close to each other two by two and then coupled together, thereby producing modulated optical pulse packets compressed as desired.

IPC 1-7

G02F 1/21; H04B 10/00; H04J 14/08

IPC 8 full level

H04B 10/516 (2013.01); H04B 10/524 (2013.01); H04B 10/54 (2013.01); H04B 10/61 (2013.01)

CPC (source: EP US)

H04B 10/40 (2013.01 - EP US); H04B 10/50 (2013.01 - EP US); H04B 10/508 (2013.01 - EP); H04B 10/60 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0394916 A1 19901031; EP 0394916 B1 19941130; CA 2015039 A1 19901024; CA 2015039 C 19930323; DE 69014390 D1 19950112; DE 69014390 T2 19950511; JP 2719397 B2 19980225; JP H02281825 A 19901119; US 5099471 A 19920324

DOCDB simple family (application)

EP 90107651 A 19900423; CA 2015039 A 19900420; DE 69014390 T 19900423; JP 10173089 A 19890424; US 51220290 A 19900420